[HeyLaughingBoy]

Think of it this way: the question isn't for you, it's for the interviewer. He/she wants to know if you're smart enough to work for him. So answering that co-worker Paul had this problem that he'd been battling for days and then he finally came to you for help, and explaining how you helped him is a valid answer. It gives the interviewer the insight he's looking for and make you look good.